Green’s Dictionary of Slang

1. (Aus.) a knee.

1960		(con. 1950-1960) R.A. Freeman Dict. Inmate Sl. (Walla Walla, WA) 20: Bumblebees – knees.
1967		‘Whisper All Aussie Dictionary’ in Kings Cross Whisper (Sydney) xxxii 7/1: bumble bees: Knees.
1983		R. Aven-Bray Ridgey-Didge Oz Jack Lang 18: Bumble Bees Knees.

2. a tree.

1999

R. Walton ‘Cockney Jack and the Beanstalk’ 🌐 He Captain Hooked in front of him. There was a bumblebee there! There hadn’t been a bumblebee there when he’d gone to sell the don’t know how.

3. VD, i.e. venereal disease.

2003

B. Dark Dirty Cockney Rhy. Sl.